You could get way more hardcore than that. First implement 5E rules:
- Class spell casting, a character can only cast a scroll if the spell is on their list.
- Restricted pick pocketing, you can only steal one item from a vendor per day.
- No feats only ability score increases, which is default rule.
- Select spells at start of day only.
- Rotate party leader to imitate TT spotlight sharing. All characters would need to be developed with some party face ability.
Off the top of my head.
